I doubt MLK would object to the marginalization of Alex Jones. Certainly modern racial justice advocates are, by and large, not clamoring for his restoration. But, we can't know for sure, and, regardless, his hypothetical opinion on this question doesn't matter very much to me.
Forcible, violent segregation by race and declining to publish videos by content and truthfulness are far too dissimilar for me to reason about their relationship in the eyes of history.
Banning on platforms for whatever reason reduces the platforms reach and raises the platform the party moves too.
We use to separate people by race now we do it by idea. Now sure martin luther king or lennon would agree.